By now the producer that we started at the beginning should have generated enough data. Stop the producer by holding CTRL + C or or CONTROL + C in each terminal window.
To inspect the metric, select the checkbox for the queue ActiveMQ.DLQ and the metric name QueueSize for the broker(s). Then click the tab Graphed metrics.
In the next step, you will learn how to create a CloudWatch Alarm. Click on the bell image (as shown in the above picture with a red doodle) for the metric to create a new CloudWatch Alarm. Continue to next step to learn how to add an alarm.